In this paper, we present an adaptive controller of piezoactuators without velocity measurement for microelectromechanical systems. The adaptive control scheme uses a Lyapunov-based adaptation law to track the system's parameters. Then, a reduced-order observer is used in a feedback loop to estimate velocity, hysteresis and disturbance. Unlike many observer-based controllers, the observer performance is taken into account in the system's stability analysis. Therefore, the controller achieves accurate displacement tracking with hysteresis/disturbance uncertainties. Furthermore, stability is guaranteed for the closed-loop system. The proposed controller's performance in coping with hysteresis and disturbance is highlighted in various simulation conditions.

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Conference 25th IEEE International Symposium on Industrial Electronics, ISIE 2016
Chaoui, H. (2016). Observer-based adaptive control of piezoelectric actuators without velocity measurement. In IEEE International Symposium on Industrial Electronics (pp. 399–404). doi:10.1109/ISIE.2016.7744923